This film takes a memorable look at World War II advanced anti-submarine operations. In June, 1944, Task Force "Guadalcanal," commanded by Captain Daniel V. Gallery, composed of the escort aircraft carrier USS Guadalcanal (CVE-60), and five destroyer escorts under the Commander Frederick S. Hall were on station off the Cape Verde Islands, where code intercepts placed German U-Boats. From the outset of the mission, Gallery made it his objective to capture a U-boat, intact, the first for the US Navy, so that it could be examined in detail by American intelligence. To that end, he developed specific tactics that led to the dramatic capture, on June 4th, of U-505, before she could be scuttled by here crew. How Gallery did it is the subject of this fascinating film that shows the operation as it happened.